import java.util.ArrayList;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: fzykd
 * Date: 2023-03-02
 * Time: 20:20
 */

public class ArrayListDetail {
    public static void main(String[] args) {
        ArrayList arrayList = new ArrayList();
        arrayList.add(null);
        arrayList.add("jack");
        arrayList.add(null);
    }
}
